Sash-balancing mechanism.



E. GEORGEFF.

SASH BALANCING MECHANISM.

APPLICATION FILED Nov.1o. 1914.

Patented Jan. 25, 1916.

II lb ll W/TNESSES THE COLUMBIA PLANDGRAPH co., WASHINGTON, n. c

eras ran moron.

EVAN GEOBGEFF, OF SAN FRANCISCO, CALIFORNIA.

EASE-BALANCING MECHANISM.

Application filed November 10, 1914.

To all whom it may concern Be it known that l. EVAN Gnonsnvr a subject of the King of Bulgaria, residing in the city and county of San Francisco and State of California, have invented certain new and useful Improvements in Sash- Balancing Mechanism, of which the following is a specification.

The present invention relates to improvements in balancing mechanism for sashes and more particularly to that type of device adapted for mounting in the window frame and for cooperating with the side of the sash, and by the employment of which the usual weights and cords will be dispensed with.

The invention has for its principal objects to provide an improved device by means of which a sash may be locked from movement upwardly, may be locked from movement downwardly and may be locked from movement in either direction, and to provide a structure which is simple in construction, may be manufactured at little cost, and is thoroughly eliicient for the purposes designed.

With the above mentioned and other objects in view, the invention consists in the novel construction and combination of parts hereinafter described, illustrated in the accompanying drawings and pointed out inthe I claims hereto appended; it being understood that various changes in the form, propor tion, size and minor details of construction within the scope of the claims may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

To more fully comprehend the invention, reference is directed to the accompanying drawings, wherein Figure 1 is a vertical sectional view of my improved sash balancing mechanism and controlling key therefor. Fig. 2 is a side elevation of my improved device with the housing cover plate removed and with the locking pawls disengaged from the gear wheel to permit the same to move freely in either direction. Fig. 3 is a view in detail disclosing the pawls in position to lock the sash from being lowered. Fig. 4 is a view similar to Fig. 3, but with the pawls in position to lock the sash from being raised. Fig. 5 is a view similar to Figs. 3 and 4 but with the pawls in position to lock the sash from movement in either direction. Fig. 6

Specification of Letters Patent.

Patented Jan. 25, 1916.

Serial No. 871,242.

is a view in front elevation of the escutcheon plate and the pawl controlling key.

Referring more particularly to the drawings, wherein like characters of reference indicate corresponding parts throughout the several views, the numeral 1 designates a window frame to which is secured a casing 2 closed by'a removable cover plate 3, and in said casing is rotatably mounted a gear wheel l which projects through an opening 5 in one side edge of the casing and coacts with a rack 6 carried by the side rail of the sash 7. A spring 8 secured at one end to the casing 2 and at its opposite end to the shaft of the gear wheel serves to counterbalance the weight of sash 7.

While but one balancing mechanism is disclosed, it is to be understood that one or more may be positioned on each side frame memher and in cooperation relative with the upper and lower sashes.

Pivotally mounted on a stud 9 above the gear wheel l are the crossed pawls 10 and 11 formed on their upper surfaces with the cam surfaces 12 and 13 and the lower ends of said pawls are normally forced downwardly into contact with the teeth of said gear wheel 4- by a spring l-it carried by a suitable mounting screw 15;

Rotatably mounted in the casing 2 above the pawls 10 and 11 is a controlling member 16 formedcentrally with a rectangular bore 17 and provided onone edge with an extended portion 18 having inclined cam surfaces 19 and 20 which are adapted when the lower ends of the pawls are disengaged from the teeth of the ratchet wheel to lie adjacent the cam surfaces 12 and 13 of the pawls 10 and 11, as in Fig. 2.

An operating shaft 21 extends through the window frame 1 and into the rectangular bore 17 and said shaft extends at its outer end through an escutcheon plate 22 secured to the frame 1. An operating knob 23 is carried bythe outer end of the shaft 21 and the same is provided with an indicating hand 2% which is adapted, as the shaft is rotated to various positions, to be seated in certain depressions 25 formed in the face of the escutcheon plate 22. A coiled spring 26 surrounding the shaft 21 and interposed between the rear of the plate 22 and a collar 27 permits of a slight reciprocatory movement of the shaft and tends to normally maintain the hand 24 in contact with the plate 22.

When the shaft 21 is rotated to a position Where the hand 2&1 rests in the depression from contact with the ratchet wheel, which will permit the sash to be either raised or lowered, as in Fig. 1. The hand 24 pointing to the indication 'Up will cause the cam surface 20 to cooperate with the surface 12 of pawl 10 and raise the same from engagement with the gear wheel 8, as in Fig. 3, and when in this position the spring is will force the pawl 11 into contact with the gear-wheel 8, and this position of the pawls will permit the sash to be raised and the sash will be locked in its highest raised position'. The hand 2 l'p0inting to the indication Locked will cause both cam surfaces 19 and 20 to be disengaged from the surfaces 12 and 13, as in Fig. 5, and this will permit the spring 14L to force both pawls into contact with the teeth of the gear Wheel and lock the wheel from movement in either direction.

When it is desired tolower the sash or to prevent the same from being raised, the hand 24 is positioned adjacent the indication Down which will cause the end of the cam surface 19 to cooperate with the cam surface 13, as in Fig. 4, and this will release the pawl 11 from contact with the gear wheel and the pawl 10 not being operated will contact with the gear wheel and lock the sash from being raised.

Having thus described my invention what I claim is 1. In a device of the character described in combination with a spring controlled balancing means,a gear wheel, a pair of pawls cooperating with said gear wheel and controlling the rotation thereof in either direction, and cam surfaces cooperating with said pawls for'controlling the engagement of either of said pawls with said gear wheel.

'2. In a device of the class described in combination with a spring controlled balancing means, a gear wheel, a pair of oppositely disposed pawls cooperating with said gear wheel and controlling the rotation of the same in either direction, and a rotary cam cooperating with said pawls for controlling the engagement of either of said pawls with said gear wheel.

3. In a device of the class described in combination with a spring controlled balancing means, a gear wheel, a pair of crossed spring pressed pawls carried by a common pivot and cooperating with said gear wheel and controlling the rotation thereof in either direction, and operating means for controlling the engagement of either of said pawls with said gear wheel. 4:. In a device of the class described in combination with a spring controlled balancing means, a gear wheel, a pair of crossed pawls carried by a common pivot and cooperating at one end with said gear wheel, a common spring for normally maintaining each of said pawls in engagement with said gear wheel and a rotary cam for cooperating with the other end of said pawls and positioned between the same for controlling the engagement of either of said pawls with said gear wheel.

5. In a device of the character described in combination with a spring controlled balancing means, a gear wheel, a pair of crossed pawls carried by a common pivot point and cooperating with said gear wheel, means for normally maintaining said pawls in engagement with said gear wheel, and operating means for disengaging either or both of said pawls from contact with said gear wheel.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EVAN GEORGEFF.

Witnesses:

HARRY A. TOTTEN, D. B. RICHARDS.

Copies of this patent may be obtained .for fiVBCBHtS each, by addressing the Commissioner of Patents.

" Washington, D. C. 

